Litter will be left uncollected on the streets in Derby City centre for a whole weekend in November to show people how much is dropped.
The city council's street cleaning team hope the experiment will make shoppers more aware about the rubbish they throw on the floor.
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After a wet and windy start, rain will clear to the north to leave it dry, with easing winds but largely cloudy skies.
Early rain will clear northwards during the morning, allowing drier conditions behind.
Thousands of patients have had their operations and appointments cancelled despite a strike by junior doctors being called off.